I have a 44x44" acrylic glass block window, pre-made (7 blocks by 7), installed into vinyl siding. We've had a lot of rain lately, and 1 time it leaked--a good puddle on the window seal. Other rains (with wind coming in its direction, too) didn't result in any inside water. Can I caulk around the outside to see if that helps, or will I make matters worse (like make it harder to take out and replace if that's what is needed)? Is it necessarily a bad window that needs replacing or might it be fixable?

Thanks!